The rig is several levels - you use two pizza stones for making pizza - one on the bottom to act as the indirect, and then one on the top for the pizza.
<a href="
http://www.clear-writing.com/images/g1.jpg">like this</a> (forgive the mess)
<a href="
http://www.clear-writing.com/images/g2.jpg">In the grill</a> (note my frayed gasket that I will soon replace)</p>
You can add another set of crosspieces and another rack on this thing. Also, the normal BGE rack fits on top (in the grill pic, you can see it on the bottom, but that's not necessary - the rig sits on top of that ridge the grill normally sits on.
With 2-3 sets of crosspieces, 2 cooking grills, and 2 pizza stones, you can do anything.